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No. I5l4,8l4. Patnted Nov. .22, I898. -F. m. KISEB.

DEVICE FOR REMOVING DRILLING TOOLS FROM WELLS.

(Application filed Mar. 1a. 1898.

(No Model.)

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NrTED STATES PATENT Trice,

FRANK M. KISER, OF PARKERSBURG, VEST VIRGINIA, ASSIGNOR TO 'WILLIAM H. KESSELMAN, OF SAME PLACE.

DEVICE FOR REMOVING DRILLING-TOOLS FROM WELLS.

SPECIFICATION forming part of- Letters Patent No. 614,814, dated November 22, 1898.

Application filed March 18, 1898. Serial No. 674,335. (No model) To all whom it may concern.-

Be it known that I, FRANK M. KISER, of Parkersburg, in the county of Wood and State of Test Virginia, have invented a new and Improved Device for Recovering Drilling- Tools from lVells, of which the following is a full, clear, and exact description.

My invention relates to a device designed to assist in the recovery of drilling-tools from wells when they have become bound by caving of the walls or other causes, and comprises a bowl attachable to the bottom of the wellcasing and having an interior coned surface at its bottom acting in connection with a clutch-dog, which is forced between the tool and said wedge-surface, so as to bind the two together.

The invention consists of novel features of construction, which will be hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a cross-section taken through the lower portion of a well-casing, showing the upper portion of the string of tools in place. Fig. 2 is a top plan view of the clutching-dog used in connection with the bowl of the device. Fig. 3 is a top plan View of the bowl, and Fig. 4 is an elevation of the bowl.

In the accompanying drawings the lower end of the casing O is shown having attached thereto at its bottom the bowl B, preferably by screw-threading the same. The bowl is reduced in interior diameter at its lower end, forming a conical or wedging surface I). The smaller diameter of the bowl is sufficient to allow it to slip easily over the largest part of the string of tools, and consequently to allow the string of tools to be lowered through the bowl without binding or the bowl lowered over the tools. The portion A of the string of tools shown is the rope-socket or the member which forms the upper end of the string of tools and to which the cable or rope for operating the tools is attached.

The slip or clutch dog D is formed of bars of iron bent into U shape and secured at the center of the bend to each other and having the ends E of the arms provided with a corrugated or toothed inner surface. These toothed heads are also wedge-shaped, so as to fit closely between the rope-socket and the conical inner end of the bowl, and are of hardened steel. These dogs are of such a size that they will slide freely in the casing and are lowered from the top through the casing after the bowl is about the tools. This'keeps the casing ordinarily clear for the tools, which may be necessary for clearing out caving sections.

In drilling wells it often happens that the sides cave in and grip the drilling-tools,so that the cable by which they are ordinarily handled is of insufficient strength to withdraw the tools. In such case the bowl B, which consists of a ferrule or hollow cylinder having its interior diameter decreased at its lower end, so as to form a conical or wedging surface, is attached to the lower end of the easing and lowered until it surrounds the ropesocket A. The slip or clutch dog D is then lowered within the casing until the corrugated or toothed ends E wedge between the bowl and the rope-socket. As the ends Eof the dog are wedge-shaped and have the same slope as the conical portion Z) of the bowl, the dog will wedge in place in the bowl and firmly engage the rope-socket.

The slip or clutch dog is shown as suspended from the bailer I simply because the bailer is always handy for such use and answers the purpose as well as anything. The corrugated ends of the clutch-dogs may be forced to place by using the bailer. When the dogs are inplace, the casing is hoisted, bringing the tools with it.

It often happens that by the caving of the well the tools are entirely covered and the casing cannot be forced down to the tools. In such case a second set of tools is secured and is used through the bowl and cavings cleaned out ahead of casing and the casing followed up until tools are reached and bowl surrounds the tools and the slips are lowered on bailer same as before. In cases where the tools are bound so that the power at command is not sufficient to start them they may often be loosened by jarring and pulling at the same time, which can be done by the use of an ordinary slip or combination socket that will take hold of rope-socket and in its outside diameter is larger than the mouth of casing-bowl, or the slips can be arranged so that both the slips and socket can be used at the same time by attaching the slip-frames to a ring, thus allowing top of tools to be free from any obstruction.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A device for recovering tools in wells, comprising a bowl or ferrule secured to the bottom of the casing and having its inner surface coned or slightly reduced in diameter at its lower end, said conical surface extending entirely about the end of the bowl, and a gripping device consisting of toothed dogs movable freely within the casing and unconnected thereto whereby when the bowl has been lowered over the tools the dogs may be lowered within the casing and forced between the bowl and tools, substantially as described.

2. A device for recovering tools in wells, comprising a bowl or ferrule secured to the bottom of the casing and having its inner surface coned or slightly reduced in diameter at its lower end, said conical surface extending entirely about the end of the bowl, and a gripping device consisting of inverted-U- shaped bars having their lower ends toothed on the inner sides, and being movable freely within and separate from the casing whereby when the bowl has been lowered over the tools the dogs may be lowered within the casing and forced between the bowl and tools, substantially as described.

3. A device for recovering tools from wells, comprising a bowl or ferrule secured to the bottom of the casing and having opposite inner Walls inclined toward each other at its lower end, and a gripping device independent of the bowl and consisting of dogs movable freely within the casing, whereby when the bowl has been lowered to surround the tools the dogs may be lowered Through the casing and forced between the bowl and tools, locking the two together.

FRANK M. KISER. lVitn esses:

V. 13. ARCHER, W. A. McCosu. 

